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Thread: 8.8" rear vs 35's

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    Top Notch Motorsports Moderator
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    8.8" rear vs 35's

    Customer brought a truck in yesterday w/ a "noise" in the rear. Truck is a 2000 or 2001 Super Crew F-150 w/ 5.4L and an auto. Truck also has some brand new 35x12.50x17 BFG Mud Terrians. Not sure how it happened, but there was a "noise" in the rear, so they had it towed in. The towing company lifted the nose and drug it in. When my buddy removed the rear diff cover, the carrier was broken in HALF. The cross pin was laying sideways and had punched a hole in the cover and the cross pin retainer was bent @ a 90 degree angle. Basically, when he took the cover off, there was a pile of clutch packs, side gears and case pieces that fell out. The ring gear has some teeth missing and the pinion had walked over the broken part of the carrier enough to make indentations on it. The truck wasn't all dirty, so I figure they must have been power braking it or something equally as harsh. When I used to race Mustangs, I broke an 8.8" rear, but it broke the cross pin in THREE pieces, which in turn ruined the carrier and side gears. I figure a set of 35's wasn't really the problem here, but the 5.4 and the weight of the Super Crew was too much. Just thought I would pass this info along. I figure if anyone is going to swap in an 8.8", you had better replace the carrier w/ a Detriot or similar aftermarket (stronger) differential.

    Jamie
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    From what I understand, only 1997, some 1998 F-150's used the 8.8" rear. All of the newer ones (half tons) use 9.75" semi-floating Visteon (sp?) axles.

    Roy
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    From your description, sounds like the crosspin retainer came loose and let the crosspin slide out........which then caught on the case and the shock load broke the carrier.
    Brad
    '90 Blazer - 6.2 diesel, 700r4, Dana 60, 14 bolt, locked, 39.5" Super Swamper TSLs, winch, rollcage, yada, yada, yada......

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    I had a 2000 Ford-150,4x4, 5.4 ex- cab. It had a 9.75 Visteon. I had a recall about the rear-end cross pin backing out. Its sounds like it happed too that truck.
    JIM
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    Nope, this is definatly an 8.8"...I also found out that it's an '01. From the lack of markings on the diff cover and where the hole in the cover is, the cross pin didn't work it's way out. You can tell by looking @ it that the half of the case w/ the cross pin in it came down together and poked the hole...I wish I could post pics.

    Jamie
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    That should be a 9.75" rear.............unless Ford slipped some leftover parts in there......which they've been known to do on occasion.
    Large: 1978 Ford F-250
    469 V-8: 340 HP, 525 TQ
    C6, NP-205, 4.10's, 42" TSL's on 15x8's
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    1410 Driveshafts, D70-U Welded, 12K Winch, OBA.

    Small: 2009 Yamaha Grizzly 700 4x4

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    Most of the 150's have 8.8" in them to this day...this is a Super CREW, not a Super DUTY. I don't know if that makes any difference. I actually don't know what kind of options they have as far as rear ends, but I do know that most of the newer F-150's have 8.8" front (reverse rotation) and rear.

    Jamie
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    I spent a couple minutes searching the net and couldn't find any reference to what the standard rear axle is on the newer F-150's. Ford's site does reference an optional 10.25" rear axle for the heavy duty towing group on F-150's, but nothing about the standard one.
    Brad
    '90 Blazer - 6.2 diesel, 700r4, Dana 60, 14 bolt, locked, 39.5" Super Swamper TSLs, winch, rollcage, yada, yada, yada......

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    I just went over to the sales department and checked the Ford source book...which has every spec of every part in them. Even in '05, the F-150 has an 8.8" rear standard, and has the option of being equiped w/ either a 9.75 or a 10.25 rear end, depending on other optional equipment.

    Jamie
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    Dirty Peter Ohio 4x4 Member
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    thanks for proving me right Jaimie, I've always said, the weakness in an 8.8 is the carrier and the tubes spinning.

    fix:full carrier locker, and weld the tubes to the diff/truss.
    "Nitrous is like a Hot Chick with an std, you know you want to hit it, but you are afraid of the consequences!!"

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